[srslte-users] Getting srsUE up and running

Wed Jul 27 11:52:28 UTC 2016

Yes, it ran in 20 MHz mode, but I didn't do much of actual IP traffic, just an attach. 
So I rebooted my PC with SpeedStep and C states disabled, currently I'm having a hard time decoding the MIB. It still detects random BW values (right now it detected after many tries 1.4 MHz which is wrong again). I don't know what to do, will keep trying to adjust the gain settings maybe I can find a good value finally. 

Cheers, 
Domi 

> From: "Ismael Gomez" <ismael.gomez at softwareradiosystems.com>
> To: "Tomcsányi," <domi at tomcsanyi.net>
> Cc: "srslte-users" <srslte-users at lists.softwareradiosystems.com>
> Sent: Wednesday, July 27, 2016 1:36:56 PM
> Subject: Re: [srslte-users] Getting srsUE up and running

> Hi Domi,
> were you able to run OAI eNodeB in 20 MHz mode? With that processor, srsUE
> should do full rate downlink in 10 MHz mode and support up to 35 Mbps. For 20
> MHz bw and to reach 75 Mbps downlink you'll need a true 4-core processor.

> On Wed, 27 Jul 2016 at 13:33 Tomcsányi, < domi at tomcsanyi.net > wrote:

>> Hi Ismael,

>> Thanks for the quick reply. I'm using an i7-6500U CPU @ 2.5GHz. I'll try to
>> disable frequency scaling and also set it to maximum performance, however I
>> find it weird that I was able to run a full eNodeB with OpenAirInterface5G
>> using the same hardware (laptop and B200) with the same frequency scaling
>> settings and phones were able to connect to it fine.
>> Also I asked my colleague who configured the eNB and it is set for 10 MHz
>> bandwidth.

>> I'll reboot now and disable frequency scaling in BIOS/EFI.

>> Cheers,
>> Domi

>>> From: "Ismael Gomez" < ismael.gomez at softwareradiosystems.com >
>>> To: "Tomcsányi," < domi at tomcsanyi.net >, "srslte-users" <
>>> srslte-users at lists.softwareradiosystems.com >
>>> Sent: Wednesday, July 27, 2016 1:26:01 PM
>>> Subject: Re: [srslte-users] Getting srsUE up and running

>>> Hi Domi,
>>> It looks like it's a CPU issue. Make sure the CPU frequency scaling is disabled
>>> and the frequency governor is set to "performance" (ie fixed to maximum MHz).
>>> Also make sure you don't run other background processes. What sort of CPU are
>>> you using?

>>> Do you have access to the enodeb to try with a lower BW, like 10 MHz?

>>> On Wed, 27 Jul 2016 at 13:21 Tomcsányi, < domi at tomcsanyi.net > wrote:

>>>> Hi all,

>>>> I'm sorry if this has been asked before on the list, but I couldn't find any
>>>> info about this using Google, so I'm turning to you:
>>>> I'm trying to connect srsUE to an LTE test network consisting of a commercial
>>>> eNB and MME. All my phones can see the network, connect to it etc. but with
>>>> srsUE I see the following:

>>>> root at LTE:~/srs/srsUE/build/ue/src# ./ue ue.conf
>>>> linux; GNU C++ version 4.8.4; Boost_105400; UHD_003.009.003-release

>>>> --- Software Radio Systems LTE UE ---

>>>> Reading configuration file ue.conf...
>>>> Using srsLTE version 001.002.000
>>>> Opening USRP with args: type=b200,recv_frame_size=9232,send_frame_size=9232
>>>> -- Detected Device: B200
>>>> -- Operating over USB 3.
>>>> -- Detecting internal GPSDO.... Found an internal GPSDO
>>>> -- Initialize CODEC control...
>>>> -- Initialize Radio control...
>>>> -- Performing register loopback test... pass
>>>> -- Performing CODEC loopback test... pass
>>>> -- Asking for clock rate 16.000000 MHz...
>>>> -- Actually got clock rate 16.000000 MHz.
>>>> -- Performing timer loopback test... pass
>>>> -- Setting master clock rate selection to 'automatic'.
>>>> -- Asking for clock rate 32.000000 MHz...
>>>> -- Actually got clock rate 32.000000 MHz.
>>>> -- Performing timer loopback test... pass
>>>> Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz
>>>> Searching for cell...
>>>> Found CELL ID: 1 CP: Normal , CFO: 1.8 KHz.
>>>> Trying to decode MIB...
>>>> - Cell ID: 1
>>>> - Nof ports: 2
>>>> - CP: Normal
>>>> - PRB: 100
>>>> - PHICH Length: Normal
>>>> - PHICH Resources: 1/6
>>>> - SFN: 0
>>>> MIB received BW=20 MHz
>>>> Initializating cell configuration...
>>>> Setting Sampling frequency 23.04 MHz
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...
>>>> Timeout while synchronizing SFN
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...
>>>> Timeout while synchronizing SFN
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...
>>>> Timeout while synchronizing SFN
>>>> No space for SSS/CP detection. Realigning frame...
>>>> Timeout while synchronizing SFN
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...
>>>> Timeout while synchronizing SFN
>>>> Timeout while synchronizing SFN
>>>> No space for SSS/CP detection. Realigning frame...
>>>> No space for SSS/CP detection. Realigning frame...

>>>> I'm using an USRP B200 with GPSDO (so not the MIMO capable B210 version) as you
>>>> can see. I'm pretty sure my ue.conf is in tact, basically just modified the
>>>> frequency and the USIM parts of it. I tried to mess around with the gain
>>>> settings since the whole setup is on my table, so not much gain is needed in my
>>>> opinion, but that didn't change much. It is weird though that MIB decoding
>>>> gives different results each time I start srsUE. The attached log you can see
>>>> shows 20 MHz of BW, but it also detects 10 MHz regularly.
>>>> Also sometimes it just says "Error receiveing from UHD: 30" and then I need to
>>>> unplug and plug in the USRP to get it working again.

>>>> I hope you can shed some on this for a newbie like me.

>>>> Cheers,
>>>> Domi
>>>> _______________________________________________
>>>> srslte-users mailing list
>>>> srslte-users at lists.softwareradiosystems.com
>>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
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